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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803e8a90651d71eb4f8640542bae695153d024251ad8de8893c4ad40034380ae' 
  AND token = 'rpQc/utL4XzoTTwO/xLxHAmd1bFP44k3KUhUg1Ysb94=' 
  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"
    }
  }
}