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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af31e6fc88242f02572754dcd24a1481db4e9eac21dd231eb24a7f7e15b6bd0' 
  AND token = 'YrBZMWPS2UVzxBiHiJM2udi4YjSEltbiGyaKQ0mrSW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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