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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ebb5fa5edce9577c908c16d6d5152bf614eb57c312980d00e7cadea7a6907a' 
  AND token = 'igMYZLacRTNX95dI3gLcPAQW4afuxMx9KsKv0zNTSKk=' 
  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"
    }
  }
}