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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18849b3db28bcb21ade514f91c2c586034a6c5490e9e402e4dd6ef650402f8e' 
  AND token = '/HwzgnpmTb5DxM0RvAdRNMMk6AIatu4GZfmXAewW4Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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