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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df18d105fcf7417e597195b04d751e055a085db7ca7e74b533b2cd71e926cd0c' 
  AND token = 'ufhAkX5SR1gxlzV5codddnWEX27L/n2Tm1IJ2uslH+M=' 
  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"
    }
  }
}