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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e880e9f28226d2c9d12d2a56b0e92ba1131fe0801156d9ab1f5e516afa390939' 
  AND token = '0H5NLWAzBPRIhrCS+PJcKnBIdBx8XW/j5sC67PjyKY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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