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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41251525d2a6cd98b3839c156dc2e198237dd4397e4f16f943adbbe57e8e0445' 
  AND token = 'iWH11SOt9oBXyyHeQulvU36Qc290n8Urtz6Fgz/KURY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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