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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24baf8ef4901fb87f9d22ed58d4bb58b47a5d5f8a68f17c370d17711364e4f9c' 
  AND token = 'rceSzcE6bhlfLq1Au4j+6Aedj4ZP0v74rJZP9zrkibg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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