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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1800801df3c65bcabb1c8c6da8e4b9eb4a820c77c344f7602727b02635d7d1f4' 
  AND token = 'DR8cUI/TsIs1kUAb5koIQz2hlDN5cg78I+884SvHprc=' 
  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"
    }
  }
}