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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d398661adaf7e85f58472b58eba3400d0cb3a8d507a2d3efb0ce2a211e0d30' 
  AND token = 'EZI0MF2Rl89I/xXN6O8RKMQeCBVtKoE+g2KmLMq/eK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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