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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdff036f78525dd4337c9171ee0737a5380db6b267e9b1d74b4cd559a974064' 
  AND token = 'PyEsWwgSLRXOGMena8SJnIB7Ao9/WYU0QA1a3e/FuoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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