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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03afddf53a6881cc906dda1150edf792bee32d7da0c405cd4a5823799cfc47b5' 
  AND token = 'iX6mx03oy0S41/+kZkrQM+R0WS/QX2AClwlfqRx7UAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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