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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f378d1daa69607bcae05ade2db39cf03d9871a71670d4ebc3d2c086079fcbfe' 
  AND token = '7UIUy9we+mKKK8s4/X7sthqUxkezYO+gzkC+hXf46To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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