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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb0c4bf7d0d027173154e478d3a605bcec648b9e6b64a8bf85a7605dc9d0b72' 
  AND token = 'hNWoF+5Q05awSqtVce3Os+viulSonbM/i4lJw9mYcwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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