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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b274805122da71bd195def54b5609e4f2e7dd477f8bd710e45aba1f35c0bca0' 
  AND token = 'zW7Ylzvlqa9zd7agN6b4U4JGd3SX6ePQTEOUQvR7Wms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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