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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7badc872777c27939cc357c6a8719b57a8fb22262286b416e6ee85e064b4d6c7' 
  AND token = 'uuuuYrJrn1m8Igf/yezUnjfSUP0RMn7DP5JZ/UFbbmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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