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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f546590c8e50e7dfd2e7e0808a852fd45f0a70797c2c2bb940efc7bdd31325' 
  AND token = 'NZ2NziXdzvWgx3mEv1YQXcfl/gecp3pQ2D0HCy5i8xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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