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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044cba3e1dd047afdd7b5d453e9ce6be258414d6d71b51512da97f1755e7a267' 
  AND token = 'ze4k5XzBX3Y8zZyUcC0Xu1shFdywSB65kCt2xm5NiG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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