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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7528783c90e28e95a421d3148794e2f4708f3e157acce1c75e8c0a0af80fc504' 
  AND token = 'jGd90OPdyLKp3v8l/x5YQwRQ3AsfDbIdebDG/mep6Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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