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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60eba2dfaad5c9d01856ea9839732e959eeee0298f17325ef285e59adc97dd8b' 
  AND token = 'Ck+A78Cziq1PvGUukQV0031pBh/RvMNx9zlSQ8ggCEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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