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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efad9a1bc3ddcc1e120a6760c5b80f3f006509e8c7619ff75d7ee95eba7854d9' 
  AND token = 'fAMx+eggI0IRHn/IBTaL7o8wxlXluiZ/F+SLdIZ7IFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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