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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc547e1780d0c869fe3e59b16c90ffcbe937d8a2626e9203dc31c274248d2b5c' 
  AND token = 'lp+h8lIFOcLltZWQEQAUQqCB63OB+j2g2M9Pq+Cork0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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