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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bac9ae4beff2a934e938d26cf41403c200880bee418cca72131d64b0a8c1a0' 
  AND token = 'wW+MjL/xujHwhb8kSqr/QJz0rJ4l3Vs966kq7f2u/5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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