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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756f2a46fa1227051a5e53bdebe85ae71b3d16086584fcd669e7566c7abeac97' 
  AND token = 'RV2C2kFgC/9l6S7+N/4mk6mVMILktI2aCZRZbsxd2mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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