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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8548b31fa81ffbdfb43f64e667dac6b0b3ef6e5f53bb1192f18c44dfbf4b7af2' 
  AND token = '97/NqRSrodqEH5PLquT4+d4RbO3eZwwo+r/iPi/nT6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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