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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce2fe21c0bb900e0e91ef62c71a60de63f2ade471caab5504d08326f90e623a' 
  AND token = 'vbT0scoHVvoAPWsCtyuJRs9v58Rp5dCP+zfiwugLCa0=' 
  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"
    }
  }
}