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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a30fd0ca9280a2e53d8b2446a4bede921e794bdc01223c9a398f1623c70a9fb' 
  AND token = '7dA5h0ee+JFLRGfVaS+pz/kSjnDrUhzn0e0vP1vXTaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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