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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c9a9e44024a98a98aeb38b45bbf58495c1eb06baadd4cbbcee3c16824564e5' 
  AND token = 'z8ttGXiMTDuW6NU7voYmW9cK3x4ne3kQ2s/Oq9SeYbg=' 
  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"
    }
  }
}