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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d844eec6dec427c0c6ca747aa69b9a4f5ee6e2db0d8461c2d364f23901e6da' 
  AND token = 'Tvo5njDrBetFW222ePzifHMZfPXICOKyPMr22WiXW74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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