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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91753726bffe58a647eaec3169ad181f4c9dc1b7a295dbd5f4fd8aeca589ff4' 
  AND token = 'tzlxN1qwIfoP+L2lIAdH0m984K0K3fvmhFOPKcz06NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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