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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '189358c4b40cd8aeba063129493a92337f8d96a64fe70678607623cc5d5bfbd0' 
  AND token = '+IOXHpeP2ejSioCv5McPitmYnBL4y5J548kyf4xiOtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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