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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65260a4357581bd08ea4d12b7a7ea3147ce1ed123e902fcaf45c75b730fd2176' 
  AND token = 'mn0z2a7RNY9wr7TQYboekWrPv51s7gimFU+qnM4A5T4=' 
  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"
    }
  }
}