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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2fdcac55316bb3e2e40ad1c17a61e7894125a7bed24add8bb2133b96507b03' 
  AND token = '01/23KghBkt0lHIrrfBPYrnhTkrBd6iRs+VrCtK1N3Y=' 
  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"
    }
  }
}