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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e062a2ad5939b465b4d0f0928accd34ef840c6aee4c61b4cf08ecaff3dada502' 
  AND token = 'OiH19bTG8iI6UTSMnal2dx2JHs8ailQxqnxSEMnYU0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}