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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0463f1a2458e123ca51179fffb9920c9c73fa7ea60786ddf5bcb7c14a6d1fec' 
  AND token = 'LX3nelvguF+Ep7DPWrA1TEngyYnW5OURsjBQ74T6fxQ=' 
  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"
    }
  }
}