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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12872d201bacff0dc2b44053a3cdf19a70ae2b4fec114e06f332c1a03000a88b' 
  AND token = '+YhXpVsVoMkh7TUU1wPo0ym403oFV9ee94hrassP5gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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