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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf0e700966d72e3ecc1381b6b0cae42bed527bc999044b2405c95032b8ee3ac' 
  AND token = 'neiUoGs3IpoSGm09R1Lf8+zNvCnaoY/H+CKV0esgZ3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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