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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c018f25f5764e65febfb0d10cd9121868d61f0c643e6696075cbcc952253887' 
  AND token = 'abC4LipRRhS8bu+SmjA5Kpg3e90DlJM0U33puL+A02o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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