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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8c90e203cbb592909c660f8afc811d889a2ddb777150e89c7c331549dde9e8' 
  AND token = 'HgIU5bgQkn1yCDwelA31Oh5X2+calIKBla70KGJczmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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