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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3419e56ea2c230b9495d0c7fabc63458d56674e76391039ec200cc00f9138d' 
  AND token = 'UvLsfnWZmMU5LxQ0NbvXzonR9Z1dUkN70cgdamo5aMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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