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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a8b4bf895b0117d254aa1872a76c51ffd05bf144cf07b6d6803708880491c0' 
  AND token = 'r+oDf7EbB1O6b/3cArj/85nv9tQKKdbj3QvotVP4eUM=' 
  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"
    }
  }
}