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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c85bb9ae1d02442d113b709589409bced6e080a7405aa535e9f13c061f3c51' 
  AND token = 'D/KWCyCrgSdoh2SJs2hqwdbOPal8cNVl7Ym6/uj9hH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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