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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd6a4c65fe3c8d48d89a64ace20ad32e29aa5fe77bf78d30970ba5d399c1a62' 
  AND token = 'k5ssotlztN3rXoxP99PmcE5mTDx6IeUtDPBCwVBa8E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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