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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b872a9527b9d89633c273e331ca5bf1c9b29e64bc49f5ffcd6cc58298dff72c1' 
  AND token = 'DM/YblPTlP2Ezxy/E8A30GdcZ0FUV2D1Y1HLdOPYXJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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