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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a085f0721944f336c791f0dae572512f0f7d53c0313d4455b059b440783284fe' 
  AND token = 'CyjFf5K5r89jv9a2HKM0Nzi+mUH1TLfFGsF/n5vpasg=' 
  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"
    }
  }
}