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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c052ab42e136149b68b2ec1c36618a7fb32a37c1242ed471cca3620a1e2515cd' 
  AND token = 'smtptYZoqF0vf0UXEhEcmYzjn8hrIQt3p/ToZMXv+r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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