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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c33724e2ea3ef679f905d4b62d6ecd9840c327eabe3ebf223340d26037a82b8' 
  AND token = '2Nrzx8q6lHr116EFilriXbJVONry1ijm8XyWSQ/3XeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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