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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9234dc20a3a71fcef380381e8dc03c5d78e9aa4269c5944a6920adc56cf4c61d' 
  AND token = 'tVc+5eggLWA9vik7hW9EondGYrJsr7pT1pDNMKNlgBg=' 
  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"
    }
  }
}