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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb8ab26dc4e9ef9a8febe4c47c1d983a3c7242b101f07a9258c4785e03b38f0' 
  AND token = 'bQZ/Bzp57sS3bhbBVNb4Xy7qJ0GCEmm+rcUkzLSPsrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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