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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '75ebcfb5e16c15112b3fe538a1bdf6c1c1eff890056abb8087331a48ad8b1f5d' 
  AND token = 'vKXlSBwoAldqZgIlsYIQ3h8l0TZf99ZMGfd9DDJx72o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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