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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6a06973a18037526f488b0388f1b80d9ef8e32c204ac79aa721c2736686ec0' 
  AND token = 'B1WDs6pFy3Bbpwl2HWnDfww/4a1z6kHw9vk6FA7jOBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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