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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5724e45b67e8a1d68d310c9369b3976e933697e2b0d45f09aabe634abe5861' 
  AND token = '3ewpuK9eo7xMGmoUDVwi+FrZ5lJelUbeN70WLRIv5ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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